Will different shafts of the same spine shoot the same?

[BuckeyeRifleman]

My predator likes 400 spined traditional only shafts. I was thinking about picking up some Gold Tip blems from Big Jim's in the same spine for practice arrows. Will they shoot the same as the traditional onlys? The GPI is only slightly different.

Maybe, maybe not! Part of it depends ion if the spines are actually the same. A lot of shafts that say .400 (or .500 or .340 for that matter) are not actually .400 spine. Also everythng else about the shaft would have to come into consideration, like diameter, wall thickness etc..

There really is no way to tell without trying them out side by side to see if they are the same.

Bisch

[Matty]

Just measured a whole batch of GT trad BLEMS I got from big jim on my spine tester. 3555's ....average 430. Notice I said AVERAGE on that same note. I have several batches of 1535 GTs and those all fall just under 500 spine on average which is 53# on the scale.....I used an ace spine tester.

[Diamond Paul]

Not necessarily.  If you read the fine print, you will see that .400 spine is a bit of a catch-all designation.  GTs .400 spine, Trad Only, and CX arrows in that same spine group don't actually all have exactly .400 spine.  The other thing is that if the diameter is different, you'd have variations based on center-shot (using .400 spine aluminums, say).  From what I recall, seems like the CX heritage arrows seem to run a bit stiffer in just about every spine designation than the others do.

[BigJim]

spine testers are not an accurate way to compare carbon arrows, gold tip or otherwise. The most important measurement is not static spine anyway, but dynamic spine...basically how it reacts in action.
With the rare exception, you will find that one dozen after another (of the same model and size) will all shoot the same when set up the same...unless you change something in your shooting....even with the fluctuation in the static spine readings.

It is not likely you will notice a difference if you use them as "practice" arrows. By shooting arrows and only utilizing field points, you will be hard pressed to tell if they are tuned for your set up anyway.
Having said that, if a 400 spine is right for your bow, with a few minor adjustments (if necessary) you should be able to shoot either mfg.

BigJim

[old_goat2]

As mentioned in first reply, diameter can make a difference. Smaller diameter have a stiffer dynamic spine because they are closer to center. I went from a .351 spine being a little weak in a normal diameter arrow to using a smaller diameter arrow in .400 spine that shoots awesome with even more point weight.

[ISP 5353]

I have no experience with GT shafts, but I can tell you that other shafts do not shoot the same as another brand.  Even the same brand shafts may be a little off if you purchased them a year or so apart.

Try broadheads at 50 yards and you will see a lot of horizontal variation.  some repeatably stiff, some repeatably weaker.  I mark my shafts a fine tune with point weight to get them all as close as I can.  Good luck!

[Friend]

Matty....

GT1535's are 600 spined shafts

GT3555's are 500 spined shafts

GT5575's are 400 spined shafts

[DanielB89]

Originally posted by Friend:
Matty....

GT1535's are 600 spined shafts

GT3555's are 500 spined shafts

GT5575's are 400 spined shafts

Matty is saying that they show one spine, but are actually a different spine.(according to a spine tester)  

Bisch has posted something like this a few times.

[Friend]

Carbon Arrow spine is one of the most significant factors that may be loosely controlled. Possibly, in part, due to inconsistent validation and the inability of the average customer to validate actual spine.

The different nominal actuals are applied to an associated common spine range. The differences have been published by many arrow manufacturers for years.

My previous post merely was intended to lightly draw attention to the previous home spine tested arrow readings and not to highlight them.
For example: A GT1535…600 spine arrow…one would expect .600 +/- a reasonable value...not the ‘just under .500’ as posted.

Do not wish someone to purchase a set of arrows based on possibly error ridden values.